Improve Travis CI configuration

cocur / slugify

Converts a string to a slug. Includes integrations for Symfony, Silex, Laravel, Zend Framework 2, Twig, Nette and Latte.

MIT License

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Closed kubawerlos closed 5 years ago

kubawerlos commented 5 years ago

removing sudo: false as recommended by Travis CI
remove --prefer-stable CI flag as composer.json is not allowing other stabilities anyway
cache whole composer directory instead of only it's cache subdirectory
remove composer self-update as it is made by Travis CI itself, no need to do it twice
add using prestissimo to speed up the install
clean up composer update flags